Bench-clamp.



0. BERG.

BENCH GLAMP. APPLICATION FILED NOV. 23, 1910.

Patented Apr. 18, 1911.

2 SHEETS-SHEET 1.

BENCH ULAMP. APPLIOATIOK FILED NOV. 23, 1910.

Patented Apr. 18,1911.

2 sums-51mm 2.

OLAF BERG, OF SEATTLE, WASHINGTON.

BENCH-CLAMP.

Specification of Letters Patent.

Patented Apr. 18, 1911.

Application filed November 23, 1910. Serial No. 593,942.

To all whom it may concern:

Be it known that I, OLAF Brno, a citizen of Norway, residing at Seattle,in the county of King and State of Washington, have invented certain newand useful Improvements in Bench-Clamps, of which the following is aspecification, reference being had to the accompanying drawings.

This invention relates to improvements in bench clamps and has for itsobject to provide a simple, eflicient, durable and convenient device ofthis character whereby the work may be rigidly clamped upon a carpentersbench.

A further object of the invention resides in the provision of new andnovel means for mounting the adjustable clamping dog and moving the samewith relation to a stationary dog secured in the bench.

With these and other objects in view the invention consists of the novelfeatures of construction, combination and arrangement of partshereinafter fully described and claimed, and illustrated in theaccompanying drawings, in which Figure 1 is a perspective view of myimproved bench clamp, showing the same ar ranged on a bench; Fig. 2 isan enlarged longitudinal section; Fig. 3 is a section taken on the line3-3 of Fig. 2; Fig. 4: is a detail perspective view of the end of theadjusting screw and the movable dog carrying block; and Fig. 5 is adetail perspective view of the adjustable clamping dog.

Referring more particularly to the drawings 5 indicates a substantiallyrectangular U-shaped guide case. This case is preferably constructed ofsteel and at one end is formed with the oppositely disposed flanges 6which are adapted to engage in the ends of a recess 7 provided in oneend of the work bench B. At its other end the case 5 is formed with thefastening arms 8 by means of which the device may be securely fastenedto the end of the bench as "by screws or other fastening devices 9. The

opposite sides of the case 5 have formed in their opposite facesadjacent to their upper edges the longitudinal grooves 9. The upperedges of the sides of the case at their ends are cut away or recessed toreceive the removable plates 10 which are adapted to be secured thereonand close the ends of the case by means of the screws 11. A slidingblock 12 is arranged within the case and moves between the sidesthereof. The bottom of the case is formed with a longitudinallyextending slot 13 which provides shoulders upon which the movable blockrests. A spring blade 14 is secured to one end of the block 12 betweensaid block and a plate 15, suitable screws extending through said plateand blade to securely fasten the latter to the block. The free end ofthis blade extends beneath the plate 10 and the edges thereof aredisposed in the longitudinal grooves 9 in the sides of the case 5. Thisspring blade is freely movable between the plate and the sides of thecase and is adapted to be extended beyond the outer end of the case inthe adjustment of the sliding block 12. A second spring blade 16 issecured to said block at its other end and in a similar manner to theblade l-l. This latter spring blade is, however, of considerably greaterlength than the former and is adapted to be coiled and uncoiled in themovement of the block 12. The end of the spring is disposed in acompartment 17 formed in one end of the case by cutting away the sidesthereof to give ample room for the spring to move as the blade itself ismoved in the grooves 9 in the sides of the case. This compartment isalso closed by securing the plate 18 upon the upper ed es of the sidesof the case. It will therefore be obvious that as the spring blade 16 ismoved into this end of the case, the contact of the same with theoutside of the closure plate will force the same down into thecompartment 17 causing the blade to coil upon itself.

The sliding dog 12 is provided with an opening 19 to receive theclamping dog 20. This clamping dog is shown in detail in Fig. 5 andcomprises a shank having a head 21 formed on one end. To the shank aleaf spring 22 is secured and when said shank is inserted in the opening19 of the movable block 12, it will be obvious that the block will beheld in its adjusted position in said opening by the resilient clampingaction of said spring against the end wall of the opening so thatconsiderable pressure upon the dog will be required to force the samefarther into or remove it from the opening of the block 12. One edge ofthe head 21 of the clamping dog is knurled to prevent the work fromslipping between the same and a stationary dog as will be later setforth.

The sliding block 12 is moved by means of the adjusting screw 23. Thisadjusting screw is threaded through the end of the case and upon its endis formed with a head 23 which is adapted to move in a socket 24 formedin one end of the block 12. The end of the screw adjacent to the head isreduced in thickness to permit of the insertion of the head through acommunicating opening in the block with the central opening 24 in whichthe same is moved.

The bench B is provided with a plurality of spaced sockets 25 into anyone of which a stationary dog 26 is adapted to be placed. This dog isprovided with a roughened edge which is disposed in opposed relation tothe corresponding edge of the movable dog 20. The work is adapted to beplaced upon the bench between the dogs 20 and 26 in the operation of myimproved clamp and the adjusting screw turned to move the dog 20 intocontact with one edge of the work to bind the same between itself andthe stationary dog 26. This may be very quickly and easily accomplishedand the work held rigidly in position while it is being planed orotherwise operated upon. The springs 14 and 16 serve to retain themovable block 12 in position between the sides of thecase 5 and whenreleasing the work itrwill be obvious that as the tendency of the spring16 is to uncoil and expand, that the work may be very quickly removedfrom between the clamping dogs by a few turns of the adjusting screw.

From the foregoing it is believed that the construction and operation ofmy improved bench .clamp will be readily understood without requiringany further description.

The device is extremely simple, practical and efficient in operation andhighly durable in construction.

While I have shown and described the preferred construction andarrangement of the various parts, it will be understood that the deviceis susceptible of many minor modifications without departing from theessential features or sacrificing any of the advantages of my invention.

Having thus described the invention what is claimed is 1. A bench clampcomprising a casing adapted to be secured in a bench, said casing havinga longitudinal opening in its top, a block longitudinally movablebetween the sides of the casing, springs secured to the ends of theblock upon the top thereof, one of said springs being movable beyond theend of the casing, said casing being provided with a chamber in itsinner end to receive the other of said springs, a dog removably mountedin said block, and means for moving the block in the casing, saidsprings retaining the block between the sides of the casing, and a dogadjustable in the bench in alinement with said movable dog.

2. A bench clamp comprising a casing adapted to be secured in a bench,said casing comprising parallel side plates and a bottom plateconnecting the same, each end of said casing being closed, platesarranged upon the upper edges of said side plates at each end thereof, ablock longitudinally movable between said side plates having an openingtherein, a dog removably held in said opening, a spring blade secured toeach end of the block upon the top thereof, said blades extending inopposite directions, one of the blades being movable between one of thetop plates and one end of the casing in the longitudinal movement of theblock, and means for moving said block, the other of said spring bladesbeing movable beneath the other top plate and adapted to be coiled uponitself in the end of the casing, said blades retaining the block inposition between the sides of the casing.

In a bench clamp, the combination with a bench, of a substantiallyU-shaped casing secured in one end of the bench, the free edges of thesides of said casing being flush with the surface of the bench, a blocklongitudinally movable between the sides of the casing, the sides ofsaid casing having longitudinal grooves formed therein, springs securedto the ends ofthe block movable in said grooves, a clamping dogadjustable in the block, an adjusting screw threaded into one end of thecasing and engaged in said block to move the same, and a stationary dogadjustable on the bench in alinement with the dog carried by the block.

4. In a bench clamp, the combination with a bench, of a substantiallyU-shaped casing having flanges formed on one end thereof, said benchhaving a longitudinal recess therein to receive the casing, the innerend of the recesses being cut to receive the flanges on the casing, ablock movable between the sides of the casing, the sides of said casinghaving opposed grooves in its inner faces, a spring blade secured to oneend of the block movable in said grooves and adapted to extend beyondthe ends of the casing, a spring blade secured to the other end of theblock movable in said grooves, the inner ends of the side Walls of thecasing being cut away to receive said spring, an adjusting screwthreaded through the outer end of the casing and engaged in the end ofthe block to move the same, said last named spring being coiled anduncoiled between the sides of the casing in the movement of the block, aclamping dog carried by the block, and

signature in the presence of two Witnesses.

OLAF BERG.

Witnesses:

MARTHA OBERKOTTER, FRANCES B. Lovnnnss.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

